Vyatta NOS documentation

Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

RSPAN overview

RSPAN mirrors traffic to a destination interface on a remote Vyatta router. RSPAN mirroring has source and destination Vyatta router. On the source router, traffic from source interfaces is mirrored to a VLAN interface (VIF). This RSPAN VLAN is dedicated to transporting mirrored traffic to the remote router. RSPAN on the destination router receives mirrored traffic on this VLAN interface and forwards it to a destination interface on this router.

Source interfaces can be both physical and VLAN interfaces. Both ingress and egress traffic on source interfaces can be mirrored. For an RSPAN destination session, the destination interface is a physical port to which a network monitoring tool is connected for capturing and analyzing the traffic.

The following figure shows an RSPAN port mirroring session on source and destination Vyatta router.

Figure 1. RSPAN port mirroring session
Note: When a packet with a VLAN ID arrives at an RSPAN source port, RSPAN creates a mirror copy of the packet and overwrites the VLAN ID in the mirrored packet with the RSPAN VLAN ID, which results in an untagged mirror copy of the original packet.